Going to do a drain and fill on a AF50-8 in an '18 Regal Tour-X. The manual says to use AC Delco AW-1 fluid, however recent GM docs online say to use regular Dexron VI (see attached image). What is the best fluid for this application, is the AW-1 anything special, or can I use a run of the mill universal such as Maxlife / Dex VI?